Fiberglass window frames can hold a heavier load without sacrificing performance or effecting weather resistance, thus allowing for larger window openings. Not only is fiberglass longer lasting and more energy efficient, it is environmentally friendly, made from partially recycled material and the plentiful natural resource of silica sand. The manufacturing process also uses less energy than that of other window materials.
Compared to other windows, Fiberglass is:
It is 8x’s stronger than vinyl. 3.5x’s stronger than wood/vinyl composites and 2x’s stronger than aluminum.
MORE ENERGY EFFICIENT
Less thermal conductivity than aluminum (500x’s less), so it doesn’t allow heat or cold from the outside into a building’s interior environment.
Almost zero thermal expansion rate (essentially the same rate as glass) means tighter seals against weather. Vinyl expands at over 7x’s this rate.
Virtually maintenance-free frames stay true to form due to strength of materials. No need for sanding, painting, or staining.